Bottle stopper



FIG. 1 is a top perspective view of a bottle stopper showing my new design;

FIG. 2 is a front elevation view thereof, the rear, left and right side being a mirror image of the front side;

FIG. 3 is a bottom view of thereof; and,

FIG. 4 is a top view thereof. 

CLAIM The ornamental design for a bottle stopper, as shown and described in the drawings. 